use crate::error::AppError;
use crate::models::*;
use crate::utils::AuthenticatedUser;
use axum::{
    extract::{Path, Query, State},
    response::Json,
};
use serde::Deserialize;

#[derive(Debug, Deserialize)]
#[allow(dead_code)]
pub struct LineageQueryParams {
    pub child_id: Option<i64>,
    pub parent_id: Option<i64>,
    pub relationship_type: Option<String>,
    pub detection_method: Option<String>,
    pub status: Option<String>,
    pub limit: Option<i64>,
}

pub async fn get_lineage_relationships(
    Query(_params): Query<LineageQueryParams>,
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
) -> Result<Json<LineageGraph>, AppError> {
    // Return empty lineage graph for now
    let graph = LineageGraph {
        nodes: vec![],
        edges: vec![],
        root_nodes: vec![],
        leaf_nodes: vec![],
        total_nodes: 0,
        total_edges: 0,
    };
    Ok(Json(graph))
}

pub async fn get_data_item_lineage(
    Path(_item_id): Path<i64>,
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
) -> Result<Json<DataItemWithFullLineage>, AppError> {
    Err(AppError::NotImplemented(
        "get_data_item_lineage not implemented yet".to_string(),
    ))
}

pub async fn create_lineage_relationship(
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
    Json(_request): Json<CreateLineageRequest>,
) -> Result<Json<DataLineageWithDetails>, AppError> {
    Err(AppError::NotImplemented(
        "create_lineage_relationship not implemented yet".to_string(),
    ))
}

pub async fn update_lineage_relationship(
    Path(_lineage_id): Path<i64>,
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
    Json(_request): Json<UpdateLineageRequest>,
) -> Result<Json<DataLineageWithDetails>, AppError> {
    Err(AppError::NotImplemented(
        "update_lineage_relationship not implemented yet".to_string(),
    ))
}

pub async fn delete_lineage_relationship(
    Path(_lineage_id): Path<i64>,
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
) -> Result<(), AppError> {
    Err(AppError::NotImplemented(
        "delete_lineage_relationship not implemented yet".to_string(),
    ))
}

pub async fn get_lineage_suggestions(
    Query(_params): Query<LineageQueryParams>,
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
) -> Result<Json<Vec<LineageSuggestionWithDetails>>, AppError> {
    Ok(Json(vec![]))
}

pub async fn process_lineage_suggestion(
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
    Json(_request): Json<ProcessLineageSuggestionsRequest>,
) -> Result<Json<LineageSuggestionResponse>, AppError> {
    // Return empty response for now - this endpoint needs a different approach
    // since the response model expects a specific suggestion
    Err(AppError::NotFound(
        "No lineage suggestions found".to_string(),
    ))
}

pub async fn get_lineage_paths(
    Path((_from_id, _to_id)): Path<(i64, i64)>,
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
) -> Result<Json<Vec<LineagePath>>, AppError> {
    Ok(Json(vec![]))
}

pub async fn get_lineage_stats(
    Query(_params): Query<LineageQueryParams>,
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
) -> Result<Json<LineageStats>, AppError> {
    // Return empty stats for now
    let stats = LineageStats {
        total_relationships: 0,
        relationships_by_type: vec![],
        relationships_by_method: vec![],
        average_confidence: 0.0,
        high_confidence_relationships: 0,
        pending_suggestions: 0,
        auto_detected_relationships: 0,
        manual_relationships: 0,
    };
    Ok(Json(stats))
}

#[allow(dead_code)]
pub async fn generate_lineage_graph(
    Query(_params): Query<LineageQueryParams>,
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
) -> Result<Json<LineageGraph>, AppError> {
    Err(AppError::NotImplemented(
        "generate_lineage_graph not implemented yet".to_string(),
    ))
}

pub async fn auto_detect_lineage(
    Path(_item_id): Path<i64>,
    AuthenticatedUser(_user): AuthenticatedUser,
    State(_state): State<crate::AppState>,
) -> Result<Json<Vec<LineageSuggestionWithDetails>>, AppError> {
    // Return empty suggestions for now
    Ok(Json(vec![]))
}
